Comprehensive investigation of various re-refining technologies of used lubricating oil: a review

Sarkar, Sandipan; Datta, Deepshikha; Deepak, K.S.; Mondal, B.; Das, Bimal

doi:10.1007/s10163-023-01685-w

Cited by 14 publications

(3 citation statements)

References 72 publications

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“…In this sense, several recycling techniques have been developed to convert WMO into valuable products. Among pyrolysis and co-pyrolysis, cracking is a promising technique for producing secondary diesel-like fuels (DLF) from WMO [10][11][12][13]. Regarding the latter, our research group demonstrated that mesoporous aluminum silicates work as effective catalysts for WMO cracking into DLF, with Ni-doped Al/Si showing outstanding catalytic activity.…”

Section: Introductionmentioning

confidence: 98%

Rapid Waste Motor Oil Conversion into Diesel-Range Hydrocarbons Using Hydrochar as Catalyst: Kinetic Study and Product Characterization

Murillo,

Juiña,

Vizuete

et al. 2024

Recycling

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Herein, raw and alkali-treated hydrochars from biomass waste are prepared as a highly active catalyst for the conversion of waste motor oil into diesel-like fuels. Among all materials, hydrochar obtained at 250 °C and subsequent alkali activation with KOH showed a 600% improvement of the kinetic constant from 0.0088 to 0.0614 m−1. Conversion values at the same conditions were also improved from 66 to 80% regarding thermal and catalytic cracking, respectively. Moreover, the activation energy was also reduced from 293 to 246 kJ mol−1 for thermal and catalytic cracking, respectively. After characterization, the enhanced catalytic activity was correlated to an increased surface area and functionalization due to the alkali activation. Finally, the liquid product characterization demonstrated that catalytic cracking is more effective than thermal cracking for producing hydrocarbons in the diesel range. In particular, hydrochar-based catalysts are suggested to promote the formation of specific hydrocarbons so that the carbon distribution can be tailored by modifying the hydrothermal treatment temperature.

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Section: Introductionmentioning

confidence: 98%

Rapid Waste Motor Oil Conversion into Diesel-Range Hydrocarbons Using Hydrochar as Catalyst: Kinetic Study and Product Characterization

Murillo,

Juiña,

Vizuete

et al. 2024

Recycling

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“…It is fundamental to discriminate the possibility of The high silicon content is now affecting re-refining processes, particularly the hydrofinishing apparatus, which operates at extreme conditions of temperature and pressure. The process involves mixing the oil from the deasphalting column with hydrogen that has been compressed at 130 bar and heated to 350 • C before being flowed into the catalytic reactor [19]. Metals, sulfur, and nitrogen compounds react with a nickel-molybdenum catalyst with a high surface/volume ratio to increase the reaction rate.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Pollutants for the Sustainable Reuse of Waste Lubricant Oils

Vitiello,

Taddeo,

Tesser

et al. 2024

Sustainability

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Nowadays, attention to the environment is increasingly emphasized by the scientific community. Different measures have been adopted to ensure a lower environmental impact and increase the sustainability of industrial processes. This work fits well with these principles, as it focuses on the determination of pollutants in waste lubricating oils derived from the industrial and automotive sectors to quantify their concentration for potential recovery and subsequent reuse. Modern waste oils, especially those derived from industrial processes, contain pollutants and metals (most importantly, silicon). It is of utmost importance to determine the silicon content in the collected waste oils to verify the possibility of recycling them since high concentrations can badly affect the industrial operations in which they can be involved. One of the most applied analytic methods for controlling the content of metals is the ASTM D5185-18, Standard Test Method for Multielement Determination of Used and Unused Lubricating Oils and Base Oils by Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES). However, this method was certified for 50 mg/kg of maximum silicon content. To extend this range, CONOU, because of its duty to monitor waste oil quality, organized an interlaboratory comparison to verify the applicability of ASTM D5185-18 and also to samples of used oils containing higher concentrations of silicon. This work describes the details of the employed methodology and the results of the interlaboratory comparison that showed the applicability of ASTM D5185-18 also to samples containing silicon concentrations higher than 1000 ppm.

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“…[9,12] However, the combined technologies such as Kinetic Technology International (KTI), Snamprogetti, Vaxon process, and Axen-Revivoil are comparatively expensive as they require high energy, sophisticated instruments, and skilled human resources. [12][13][14] In conventional technologies, the most significant disadvantage of the acid-clay treatment technique is the production of acidic sludge. [12] Catalyst poisoning, high hydrogen gas supply, high operating and capital costs, and high safety standards are the key drawbacks of hydrotreatment methodologies.…”

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confidence: 99%

Assessing the efficacy of three bio‐based flocculants in the reclamation of spent lubricating oil

Sarkar,

Datta,

Saha

et al. 2024

Can J Chem Eng

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The current study encompasses a comprehensive assessment of three biopolymeric flocculants on the overall performance of recycling waste lubricating oil to achieve a higher percentage recovery, flocculation efficacy, and better quality of recovered base oil. The findings reveal that with experimental conditions such as (i) mixing time of 80 min; (ii) agitation speed of 400 rpm; (iii) reaction temperature 50°C; (iv) solvent to waste oil ratio 3:1 g/g; and (v) flocculant dosage 1 g/ kg of solvents, 1‐butanol and sodium alginate gives highest percentage yield of 91% followed by corn starch of 89.10% and xanthan gum of 87.18% as bio‐polymer flocculant. The effects of various process parameters of bio‐flocculants on flocculation efficiency are expounded. With the process parameters of (i) initial pH of 5.9, 6.0, and 6.2; (ii) mixing time − 59, 60, and 63 min; and (iii) solution temperature of 59, 60, and 62.2°C, maximum flocculation efficacy (% sludge removal) of 16.24%, 13.01%, and 14.09% were attained for the cases of refined oil treated with sodium alginate, corn starch, and xanthan gum, respectively. Results also reveal that the physicochemical properties of refined base oil treated with 1‐butanol and sodium alginate as bio flocculant are almost close to the virgin lubricating oil. The optimum recovery of high‐quality base oil with the adoption of green technology and solvent–bio flocculant combination can mitigate the environmental impact of waste oil and create an energy‐efficient sustainable condition for the regeneration of re‐refined base oil.

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Comprehensive investigation of various re-refining technologies of used lubricating oil: a review

Cited by 14 publications

References 72 publications

Rapid Waste Motor Oil Conversion into Diesel-Range Hydrocarbons Using Hydrochar as Catalyst: Kinetic Study and Product Characterization

Rapid Waste Motor Oil Conversion into Diesel-Range Hydrocarbons Using Hydrochar as Catalyst: Kinetic Study and Product Characterization

Analysis of Pollutants for the Sustainable Reuse of Waste Lubricant Oils

Assessing the efficacy of three bio‐based flocculants in the reclamation of spent lubricating oil

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